Device for making polygonal tubes



(No Model.)

A. D. MOGARTY.

I DEVICE FOR MAKING POLYGONAL TUBES. No. 271,492. Patented Jan/30, 1883.

Um'rsn Sra'res Farmer @rrrea.

ADELBERT D. MGOARTY, OF EAST HAHPTON, CONNECTICUT.

DEVICE FOR MAKING POLYGONAL. TUBES.

SPECIFICATION forming part of Letters Patent No. 271,492, dated January 30, 1888.

Application filed March 17, 1882. (No model.)

'T all whom it may concern Beitknown that I, ADELBERT D. MCGARTY,

of East Hampton, in the county of Middlesex ings constitute part of this specification, and

cylindrical tubing and work it into the polygonal shape, usually hexagonal. This fine brass has been necessary because of the impossibility, under the usual method, of making sharp angles, which are essential to nice work; hence this class of handles have been expensive and only used for the nicest class of work.

The object of this invention is to construct the bar from common tin or similar cheap sheet metal; and it consists in taking a strip of tin' a little wider than the circumference of the tube or handle-bar to be produced, and with dies prepared for the purpose bend the strip around a former, shapingfirst one angle, then another, successively forming the several angles, until finally the two edges are brought to gether to be soldered or otherwise fastened, as more fully hereinafter described.

A represents the lower part of the die, which may be arranged on the bed of a common stamping-pr esg B, the movable part of the die, which is arranged in the reciprocating part of the. press in the usual manner, each part constructed respectively with a corresponding angle, a 1), according to the angle to be formed, here represented as to make a hexagonal shape, the face of the die each side the angle corresponding to the respectivesides of the tube to be produced.

G represents a former, which corresponds in shape to the interior ofthe tube to be produced.

D represents the strip of sheet tin or metal to be employed.

E is a guide arranged parallel with the angle of the dies, and distant therefrom, so that one edge, 67, ot' the strip will lie against said guide when the other, e, is in proper position with relation to the upper angle of the former 0 when laid thereon, as seen in Fig. 1, so that the edges projects over the upper angle of that former. The former lies in the lower part of .the die, and in the position seen in Fig. 1,the part B of the die is forced down upon the strip, turning its edge 0 down and forming the first angle, as seen in Fig. 3. As the first edge is to be inside the tube, in order to make a strong joint, the former O has a rabbet or groove,f, formed on the face of its first angle or side, corresponding to the thickness of the metal, so that this last, striking, will force the edge 6 into that rabbet, as seen in Fig.- 3. The first angle shaped, the former is turned to present the next angle,'as seen in Fig. 4, and with it the strip is also turned, bringing the projectingpart into the position seen in broken lines, Fig. 4.. Then'the part B isagain forced down, bending the strip over the second angle of the former, as seen in Fig. 4. The second angle formed, the former is again turned, as seen in Fig. 5, to form the third angle, and so on through the successive angles, as seen in Figs. 6, 7, and 8. In the last operation the edge (I is brought down upon the turned-in edge e, to which it may he soldered. By these successive bendin gs of the strip over the former G the angles are formed clean and sharp, and equallyas" good as can be made from tubing of finer metal. The expense attending this method of making the tubing is no greater than that usually employed for making the same shaped bar from finer metal, and, because when done it affords as perfect surface and angles as the finer metal, the bar is equally as good for all purposes for which these bars or tubes are employed.

For different-sized tubes, it will be understood, the guide E will be moved farther from the angles of the die, so as to bring the strip into proper relative position to the former and dies.

WVhile specially adapted to making the tubes from cheaper kinds of metals, this method and dies may be employed to advantage in making such tubes from finer metal. I therefore do not wish to be understood as limiting the invention to any particular kind of metal.

I claim- The combination of the two parts A B of the die, each constructed with faces forming an angle corresponding to the sides and angle IO of the tube to be produced, with a former in- I trodnced between the said two parts of the die and resting in the angle of one part, while the other part bends the strip over the angle of the former above, and the guide E, arranged parallel with the angle of the dies, substan- 15 tially as and for the purpose described.

ADELBERT D; MOGARTY. \Vitnesses:

ELLEN E. MoGAR'rY, CHAS. E. MORTON. 

